Resilient cap-jewel setting with index disk plates for clockworks



Sept. 24, 1929. A. ERlSMANN-SCHINZ 3 5 2 RESILIENT CAP JEWEL SETTING WITH INDEX DiSK PLATES FOR GLOCKWORKS Filed July 11. 1928 Patented Sept. 24, 1929 PATENT OFFICE UNITED STATES ADOLPHE ERISMANN-SGHINZ, OF NEUVEVILLE, SWITZERLAND, ASSIGNOR TO BENJA- MIN ERISMANN-GIESS, OF SAGINAW, MICHIGAN RESILIENT GAP-JEWEL SETTING WITH INDEX DISK PLATES FOR GLOCK'WORKS Application filed July 11, 1928, Serial No. 291,768, and. in Switzerland December 20, 1927.

This invention relates to clock work construction and appertains particularlyto the provision of a resilient cap jewel setting associated with the index disk plate, in watches.

In the watch art it has recently become usual with the better class of movements, to arrange the end stone or cap jewel, that 1s, the rear support for the pivot of the balance staff, in a resilient fitting so that the cap jewel reacts resiliently against the ax1al pressures or impacts of the balance staff. The. technical eifect of such an arrangement, while not of great importance, nevertheless, offers a certain degree of protection against breakage of the pivots of the balancestaff,

or the cap jewel.

The present invention has for 1ts ob ect the provision of a simple and practlcal construction for the resilient mounting of the cap 2 jewel.

Other objects of the invention Wlll appear as the following description of a preferred embodiment thereof proceeds.

According to the invention the cap ewel lies freely in the opening of the index d1sk plate and is pressed resiliently against the pivot of the balance staff by res1l1ent parts of a support which is clamped fast to but easily detachable from the index disk plate.

An exemplary embodiment of the sub ect of the invention is illustrated in the accompanying drawing in which:

Fig. 1 is a cross section and,

Fig. 2 is a plan view.

Attached to the back of the balance block 1, by means of screws 2 is the part 3 of a twopart index disk plate, the other part of which is indicated at 8. On the part 3 is carried the index lever 4 having a split ring 5 which is sprung on to the part 3 and rotatable with friction.

The opening 6 of the part 3 has a rabbet 7 in which the other or inner part 8 of the index disk plate is fitted. The part 8, which is held fast by the part 3 to the balance block 1, has a shoulder on which the cap jewel 9 is freely seated. The balance. block is provided with a perforated jewel 10 which serves as a bearing for the rear pivot of the balance stafi, the latter abutting against the adjacent face of the cap jewel.

The annular support or retaining member 11 of the. cap jewel is clamped fast between the two parts 3 and 8 of the index disk plate. inwardly directed spring tongues 12 which are applied resiliently against the edge of the arched side of the cap jewel and tend to press the latter to its seat, or against the adjacent end of the pivot of the balance staff 13 so that axial shocks or pressures which would otherwise be transmitted to the balance staff are taken up and damped by the elastically reacting cap jewel 9.

The parts 3 and 8 of the index disk plate, the index lever itself and the resilient support 11 are usually made of steel although the support 11 is sometimes made of precious metal for ornamental effect.

This support is provided with r The cap jewel might be mounted in other ways without transcending the scope of the invention. However, the arrangement shown is preferred as it provides a relatively large space 14, which serves as an oil sump for the reception of lubricant.

As a particularly practical advantage of the cap jewel set-ting as above described it is to be noted that all the elements are secured in position by the two screws 2. The mechanism may thus easily be taken apart and again assembled, which is of importance for the purpose of repairing, cleaning, etc.

While. I have in the above description disclosed what I believe to be a practical and preferred embodiment of the invention it is to be understood that the specific details are illustrative only and not in themselves limitative of the scope of the invention.

What I desire to claim as my invention 1. In a watch construction, an index disk plate having an opening therein, a balance staff pivot, a cap jewel freely mounted in said opening in said index disk plate, and resilient means for pressing said cap jewel against the end of said pivot, the said index disk plate comprising two parts, one having a shoulder and the other part retaining the first part, the cap jewel being seated 011 said shoulder, and said resilient means being clamped between said parts.

2. A watch construction as claimed in the preceding claim, said cap jewel being seated on said shoulder, said resilient means being formed with resilient tongues which are applied against the cap jewel.

In testimony whereof I have signed my name to this specification.

ADOLPHE ERISMANNSCHFNZ 

